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HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Tail fin blurring (vibration)
04-06-2009 03:25 AM  9 years agoPost 1
Parsifal

rrVeteran

Singapore

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Hi,

After a countless number of flights with my Vibe 50, and after a rebuild post crash, the vibe has developed a mysterious vibration resulting in the tail fin blurring in the hover... the bottom vip rapidly moving from side to side to the tune of maybe 2 inches.

I at first thought, engine alignment, so redid that, then changed every single shaft save for the tail torque tube and the start shaft.

Any ideas what could be causing this?

The vibe has had close to 500 flights on it and has had 4 crashes to date at which point all parts were replaced with new stuff.

Wondering if potentially the start shaft could be causing the vibes since its been over 500 flights and the part of the shaft that goes into the clutch one way bearing might be a bit worn? Clutch is a new one as well.

Everything is balanced and dialed too.

Alternatively, could the frames being old and slightly worn be an issue?

Any thoughts would be much appreciated.

Also, this is not the same as the humming type of vibration just to be clear. I have had no such issues with my vibe since i did the first round of engine alignment and 2 bearings in the tail.

Thanks.

Pars.

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04-06-2009 03:41 AM  9 years agoPost 2
Dood

rrProfessor

Wescanson

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Try putting some green Loctite on the tail output shaft to fix it to the inner races of the support bearings so it doesn't turn within the inner races.

  ▲
▲ ▲

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04-07-2009 09:16 AM  9 years agoPost 3
Parsifal

rrVeteran

Singapore

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Thanks for that... will try it out, although, both the side panels are brand new along with the tail shaft, changed them over the course of the last two weeks in trying to solve this problem i am having.

Wondering why they would be causing an issue this time around, is this common..?

In any case, thanks again.

Regards,

Pars

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04-07-2009 03:01 PM  9 years agoPost 4
electrosphere

rrNovice

perth, australia

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well mine is caused by a bent engine crankshaft...and unbalanced tail blades...

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04-08-2009 12:41 AM  9 years agoPost 5
mdu6

rrKey Veteran

Montreal

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Normaly, a fin vibration (2 inches is very violent !) is caused by the engine and/or drive train - incorrect engine tuning and/or mechanical problem - balance, fan, clutch, pinion, bearing etc.

Do test #1:

Hover at about 3 feet from the ground and once the vibration is present (we assume it is 'always' present ?), hit throttle hold
and see what happends to the vertical fin ... does the vibration
almost goes completly away as you hit throttle hold ?

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04-08-2009 03:11 AM  9 years agoPost 6
Helico-pteron

rrVeteran

Glenview, Illinois

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Balance the tail as one part.

Just take the hub off with the grips and blades still attached and check it's balance.

Also, do what mdu6 suggests.

Lets narrow this beotch down.

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04-08-2009 03:42 AM  9 years agoPost 7
concho

rrApprentice

montreal canada

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take a look at the clutch pinion bearing

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04-27-2009 02:50 AM  9 years agoPost 8
Parsifal

rrVeteran

Singapore

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Ok... After countless hours of fiddling and rebuilding (stripped it down to change frames even, in addition to most of the tail components, save the mixing arms, all rotating shafts, clutch, clutchbell, main gear, one way, and so on and so on... i have finally figured out the problem...

Swapped the actual tail fin with a mate's vibe 50 and it stopped blurring.

#$@#)#$%*%(#)#*(@*#(*@_#!!!!!!

I know there is an inherent minor vibration there, but i think it was not as bad as i thought given the fin going crazy, comparing fins, mine seemed a lot softer than those on others' vibes. Odd, considering its new from JR...

In any case, happy again.

PArs

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04-27-2009 10:59 AM  9 years agoPost 9
tchavei

rrProfessor

Portugal

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Now thats something new!

I have a carbon one I got to save 7gr in the tail and it has been working flawlessly (its strong enough to survive most crashes).

Maybe thats something you could consider?

Tony


--------------------
"Perfection and patience usually walk side by side..."

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04-27-2009 04:41 PM  9 years agoPost 10
Parsifal

rrVeteran

Singapore

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Where did you get a carbon tail fin? ITs funny, it was one of the first things a friend suggested i change but i refused to believe it could be something that simple... Spent enough to buy a new kit before i gave in and tried... hahaha.. oh well, live and learn i guess..

Pars

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04-27-2009 04:46 PM  9 years agoPost 11
concho

rrApprentice

montreal canada

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a tail vibration could come from a high percentage nitro 30%
with a stock head shim (detonation problem )
i resolved that problem by adding a 8 mm additional head shim to the engine head
lower percentage nitro will also help

if you keep the stock shim a colder plug with 30% may help
with lower compression your bearings will last longer to

good luck

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04-27-2009 07:09 PM  9 years agoPost 12
tchavei

rrProfessor

Portugal

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I bought the fin in the states but dont ask me the name of the store because I can't remember... it was the same one that is now selling the carbon radio tray... I will look for it.

Tony


--------------------
"Perfection and patience usually walk side by side..."

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04-28-2009 03:25 AM  9 years agoPost 13
Parsifal

rrVeteran

Singapore

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Ah... i think i know the one, name escapes me at the moment though... was tempted to try the radio tray...

As for the engine, this is the 3rd YS50 (on 30% CP) i am using in this vibe, never had any problems with either of the old ones, although i kinda see your point as a potential cause. Thanks.

Pars

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